I have had tremendous success using your choke tubes as a first year ATA shooter. The advantage of your choke tubes has accelerated my success in shooting my first 25. One week after purchase. A week later came my first 50 and 75 at the NY state grounds. I have tested the chokes myself. They significantly improved my pattern over the stock Browning Invector Plus tubes I was using with my Browning XT. After testing at the club, my cheap XT with a U3 had a very similar, close to and as good as the compared Perazzi TM1 fixed full and MX2000 34" fixed full. Wilkinson chokes seem to be the standard as the best trap chokes or choke work. I believe that Jimmy's are just as good, without sending your gun out and having to wait. There is a big market for your tubes for trap.